Hi, On Wed, 22 Oct 2014 20:05:48 +0000 (UTC) James wrote: > Hello, > > So looking at the package sys-cluster/ceph, I see these flags: > cryptopp debug fuse gtk +libaio libatomic +nss radosgw static-libs tcmalloc > xfs zfs No specific flags for btrfs?
Ceph is optimized for btrfs by design, it has no configure options to enable or disable btrfs-related stuff: https://github.com/ceph/ceph/blob/master/configure.ac No configure option => no use flag. > ceph-0.67.9 is marked stable, while 0.67.10 and 0.80.5 are marked > (yellow) testing and *9999 is marked (red) masked. So what version > would anyone recommend, with what flags? [1] Just use the latest (0.80.7 ATM). You may just nerame and rehash 0.80.5 ebuild (usually this works fine). Or you may stay with 0.80.5, but with fewer bug fixes. > Ceph will be the DFS on top of a (3) node mesos+spark cluster. > btrfs is being set up with 2 disks in raid 1 on each system. Btrfs > seems to be keenly compatible with ceph [2]. If raid is supposed to be read more frequently than written to, then my favourite solution is raid-10-f2 (2 far copies, perfectly fine for 2 disks). This will give you read performance of raid-0 and robustness of raid-1. Though write i/o will be somewhat slower due to more seeks. Also it depends on workload: if you'll have a lot of independent read requests, raid-1 will be fine too. But for large read i/o from a single or few clients raid-10-f2 is the best imo. > Guidance and comments, warmly requested, > James > > > [1] > http://ceph.com/docs/v0.78/rados/configuration/filesystem-recommendations/ > > [2] http://ceph.com/docs/master/release-notes/#v0-80-firefly Best regards, Andrew Savchenko
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